Drug interactions
Candesartan-hydrochlorothiazide + Olmesartan
Severity: Major
Candesartan-hydrochlorothiazide and Olmesartan: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Taking two ARBs together provides no added benefit and increases the risk of hypotension, hyperkalemia, and renal impairment. The thiazide does not reliably prevent these effects.
What this interaction means in plain words
Candesartan-hydrochlorothiazide and Olmesartan can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Candesartan-hydrochlorothiazide belongs to Cardiovascular; Olmesartan belongs to Cardiovascular.
Why it happens
Duplicate AT1 receptor blockade produces additive reductions in aldosterone effect and glomerular filtration pressure.
What to do
Avoid dual ARB therapy and use a single agent. If used together, monitor potassium, creatinine, and blood pressure.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Candesartan-hydrochlorothiazide
- Aliskiren + Candesartan-hydrochlorothiazide Contraindicated
- Candesartan-hydrochlorothiazide + Dofetilide Contraindicated
- Candesartan-hydrochlorothiazide + Sparsentan Contraindicated
- Acemetacin + Candesartan-hydrochlorothiazide Major
- Amifostine + Candesartan-hydrochlorothiazide Major
- Amiloride + Candesartan-hydrochlorothiazide Major
Other interactions of Olmesartan
- Aliskiren + Olmesartan Contraindicated
- Olmesartan + Sparsentan Contraindicated
- Aldesleukin + Olmesartan Major
- Amifostine + Olmesartan Major
- Amiloride + Olmesartan Major
- Amlodipine-benazepril + Olmesartan Major
Frequently asked questions
Can I take Candesartan-hydrochlorothiazide with Olmesartan?
MediHelp rates the interaction as major. Candesartan-hydrochlorothiazide and Olmesartan can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Taking two ARBs together provides no added benefit and increases the risk of hypotension, hyperkalemia, and renal impairment. The thiazide does not reliably prevent these effects.
How serious is the interaction between Candesartan-hydrochlorothiazide and Olmesartan?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid dual ARB therapy and use a single agent. If used together, monitor potassium, creatinine, and blood pressure.
What other medicines interact with Candesartan-hydrochlorothiazide?
MediHelp also lists interactions of Candesartan-hydrochlorothiazide with, for example, Aliskiren, Dofetilide, Sparsentan. The full list is on the Candesartan-hydrochlorothiazide page.
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